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It would probably be better if you file an issue here: https://github.com/Dart-Code/Dart-Code/issues
Having both extensions is correct, the Flutter extension depends on the Dart one. Ununinstalling and reinstalling is unlikely to have any impact. What's likely happened here is that something you did caused VS Code to open the file without a drive letter (https://github.com/microsoft/vscode/issues/108660) and when this is sent to the Dart analysis server, it can't handle it because it doesn't know what the drive letter is supposed to be.